Dental alloy



UNITED STATES PATENT OFFICE DENTAL ALLOY Jakob Spanner, Nen-Isenburg,Germany, assignor, by mesne assignments, to Chemical Marketing CompanyInc., New York, N. Y.

No Drawing. Application May 11, 1938, Serial No.

207,383. In Germany May 12, 1937 1 Claim. (01. 75-172) Objects of myinvention are dental alloys which as are customary for casting alloysand solders. are particularly suited for casting and soldering Suchadditions are for instance copper, silver, zinc, purposes. cadmium,manganese, chromium, tin either singly The ordinary alloys with a lowmelting point or a mixture of two or more of them in similar such as areused for instance for soldering of quantities, for instance up to 10 oreven up to 15%. dental prostheses consist chiefly of precious metalsThese metals have the effect of lowering the twhich may contain in somecases relatively small ing point of the alloys. additions of suitablenon-precious metals. The The following are a number of examples which.

10 dental solders which are most commonly in use show compositions ofalloys according to my inare for instance gold-, silver-, copper-alloysand vention:

palladium-silver-alloys with addition of such metals as zinc andcadmium. Example 1 Parts The objects or this invention are alloys withby weight relatively small contents of precious metals which Pd 45 1 mare par icularly suitable for the purposes of cast- Fe ins and solderingartificial dentures.

I have found that this purpose is served in an excellent mannerby theapplication of such alloys Example 2 as contain palladium as preciousmetal and metals 20 of the iron group as non-precious metals, the P 36-latter metals being used either singly or in com- Ni 58.0 bination ofseveral of them. Cu 4.0

A dental alloy in accordance with my invention which is particularlyuseful consist for instance of Zn 1.5 u about 20-60 parts, in preferenceof about 30-45 parts by weight of palladium, the rest being iron,Example 3 nickel, cobalt either alone or in combination of Per cent twoor more of the latter. y 2 5 2 Alloys of the described kind do nottarnish and Pd so are very resistant against the attack of agressiveagents such as occur in the mouth. They further e N1 n Small quantitiesof M8- excel by the fact that they can be very easily cast, I What Iclaim is: they can easily be worked upon and are especially A dentalalloy which consists of 20-60 percent suitable for soldering parts ofmetals which have of palladium, 4-15 percent of chromium and the u ahigh melting point forinstance-sucli which conremainder substantiallyall iron, said dental alloy sist of non-tarnishing steel such as are forinbeing characterized in being easily cast, tarnish stance known by thetrade as vlA-steel or cobaltresistant. resistant against the attack oraggressive chromlum-tungsten-alloys such as are used for agentsoccurring in the mouth, and suitable for dental prostheses. soldering. o

' The alloys may contain such additional" metals JAKOB SPANNER.

